MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
4-4
Freescale Semiconductor
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R PORS
ERS
LLRS LCRS WDRS
CRS
0
0
0
0
0
0
0
0
SSRS SERF
W
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0xC
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R WKP
CFG
0
0
0
0
0
0
0
0
0
0
0
0
BOOTCFG
RGF
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
—
3
0
Reg Addr
Base + 0x000C
1
The RESET values for this register are defined for power-on reset only.
2
The RESET value of this bit or field is determined by the value latched on the associated pin or pins at the
negation of the last reset.
3
The RESET value of this bit or field is determined by the value latched on the associated pin or pins at the
negation of the last reset. BOOTCFG can also be loaded with a default instead of what is on the associated pin
or pins.
Figure 4-1. Reset Status Register (SIU_RSR)
Table 4-2. SIU_RSR Field Descriptions
Bits
Name Description
0
PORS
Power-on reset status
0 No power-on reset has occurred.
1 A power-on reset has occurred.
1
ERS
External reset status
0 No external reset has occurred.
1 An external reset has occurred.
The ERS bit is also set during a POR event.
2
LLRS
Loss-of-lock reset status
0 No loss-of-lock reset has occurred.
1 A loss-of-lock reset has occurred.
3
LCRS
Loss-of-clock reset status
0 No loss-of-clock reset has occurred.
1
A loss-of-clock reset has occurred due to a loss of the reference or failure of the
FMPLL.
4
WDRS
Watchdog timer/debug reset status
0 No watchdog timer or debug reset has occurred.
1 A watchdog timer or debug reset has occurred.
5
CRS
Checkstop reset status
0 No enabled checkstop reset has occurred.
1 An enabled checkstop reset has occurred.
6–13
—
Reserved.
Summary of Contents for MPC5553
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